| Effects of limited irrigation on water and nitrogen transport and use in spring wheat rootzone soil in Shiyang River basin |
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| DOI：10.7606/j.issn.1000-7601.2008.06.11 |
| Key Words: limited irrigation soil water NO-3-N transport accumulation use of water and nitrogen spring wheat |
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| Abstract: |
| The objective of this study is to explore the best coupling form of water and nitrogen in arid areas of northwest China．A field experiment was conducted in the oasis region of Shiyang River basin and the effects of limited irrigation on water and nitrogen transport and use in spring wheat rootzone soil were investigated．The results showed that NO-3-N accumulation in root soil was mainly concentrated in the 0～40 cm profile before the jointing stage and the accumulation was about 550 kg／hm2．NO-3-N was leaching in the rootzone soil of high water treatment from 62 days after sowing and the NO-3-N accumulation of high water treatment was 0．76times of that of lower treatment in the profile．The residual NO-3-N of lower water＞low water＞middle water＞high water at harvest time and the residues of lower water treatment is1．75times of that of high treatment． A linear decreasing correlation existed in the accumulation of NO-3-N and soil water storage after jointing stage．The yield of high water was higher than that of middle water by4％ while the amount of irrigation was higher by 30％．The irrigation amount of 360～280mm in the whole growth period could guarantee yield and water use efficiency on the condition of deficit water resources. |